Electrical smelting-furnace.



YATENTEE MAR. 31, 1M8.

K. A. R IORTHQ ELECTRICAL smsmma yumxwza.

APPLICATION FILED NOV. 20. 1906 J/JZMM UNITED STATES PATENT OFFICE.

KARL ALBERT FREDRIK nioa'rn, or GHRISTIANIA, NORWAY.

ELECTRICAL SMELTING-FURNAGE.

Patented March 31, 1908 To all whom it may concern: Be it known that I, KARL ALBERT FR D- RIK HIoRTn, a sub'ect of the King of Norway, residing at C ristiania, Norway, have invented, certain new and useful Improvements in Electrical Smeltin -Furnaces; and I do hereby declare the fo lowing to be a full, clear, and exact descri tion of the invention, such as'will enable 0t ers skilled in the art to which it appertains to make and use the same, reference being had to the accompanymg drawings, and to the letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to electrical smelting furnaces with inductioniheating and has for its object an arrangement of such furnaces,

designed to considerablyincreasetheir effi ciency.

Referring to the accompanying drawing Figure 1 is a vertical section, Fig. 2 plan of a furnace embodying the present invention, and Fi My invention consists in so arranging the electrical induction device as to permitof alternatively or simultaneously using the same for two or more furnaces. As furnaces of this kind need frequent repairs and such re-' airs take considerable time, because the ining must dry slowly, the induction device by grouping two or more furnaces A, A v i gs. 1 and 2) beside or around one common induction coil with core B. .'.The magnet yoke C 'is' assed. through the central aperture and (etachabl'y secured to the core B. When re airs are to be effected on the furnace-A, .t e magnet yoke C may be lifted out of the same and placed in the furnace A, where it maybe secured to the opposite side of the core B in the position indicated in dotted lines.

Of course the furnace may be provided with as man yokes C as there are furnacerings A and a lof thembe connected with the core B. If one of the furnace rin is out of operation, the yoke belonging to t is furnace may be disconnected from the core.

Where four furnaces are grouped around a common induction coil instead of two, three 3 and 4 are cross sections of fur-I naces s owing modified arrangements.

' of them might be operated at a time, while the fourth one is being repaired.

In Fig. 3 I have shown a modification, Where one common magnet hoop D is used for two furnaces A, A, in which case the induction coil may be suitably arranged on the branch of the magnet hoop extending on the underside of the furnace. the core with the induction coil may be detachably secured to the magnet yoke D so as to be available for other furnaces.

In Fig. 4 I have shown an arrangement, in which the furnaces A, A are placed as concentric rings, one inside the other, and having a common induction ap' aratus E.

An inconvenience, whic with the induction furnaces now in use but avoided in the resent invention consists in the necessity of completely discharging the furnace at each renewal of thelining and of introducing into the newly lined furnace, previously to resuming the o eration, a cast lIOIl wheel rim fitting into the mterior space of the furnace so as to permit of its melting down. In furnaces arranged in conformity with the resent invention no such arrangement will be re uired, as the charge may be taken over direc ly from the furnace, whose lining is to be renewed, into the furnace ready for use for further treatment; in this wav the consumption of energy will also be reduced.

I claim.

'1. The combination with a plurality of furnaces, a-magnetic circuit common to all of them and a singlemagnetizing coil for said circuit.

2. The combination with a plurality of concentric furnaces, of a magnet, its core and means to complete the magnetic circuit between the ends of the core "and through the furnaces.

, 3. The combination with a plurality of annularfurnaces', of a magnet, its core and means to complete the magnetic circuit between the ends of the core, said means passing through the centers of the annular furnaces. 1

In testimon that I claim the foregoing'as my invention, have signed my name in presenc of two-subscribing witnesses.

KARL ALBERT FREDRIK HIORTH.

Witnesses Tnos. HERN, J. VAALER.

is connected 

